Creatine helps build muscle mostly by keeping muscle cells hydrated and reducing breakdown, not by making your body produce more muscle protein.
Evidence from Studies
Supporting (1)
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Effects of acute creatine monohydrate supplementation on leucine kinetics and mixed-muscle protein synthesis.
The study found that creatine didn’t boost muscle building but may help prevent muscle breakdown, especially in men, which supports the idea that its main benefit comes from preserving muscle rather than building it.
Contradicting (2)
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No effect of creatine supplementation on human myofibrillar and sarcoplasmic protein synthesis after resistance exercise.
The study looked at whether creatine helps muscles grow by reducing protein breakdown after exercise, but found that creatine didn’t affect protein breakdown or building at all.
Creatine supplementation has no effect on human muscle protein turnover at rest in the postabsorptive or fed states.
The study looked at whether creatine changes how muscles build or break down protein, and found it doesn’t affect either—so it doesn’t support the idea that creatine works by reducing muscle breakdown.
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.